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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <script>
        let arr = [1,2,3,4,5,6,7,8,9,10];
        //1. 数组去重;
        //let result = [...new Set(arr)];
        //console.log(result);
        //2. 交集;
        let arr2 = [2,5,6,7,8,9];
 /*
          
            let result = [...new Set(arr)].filter(item =>{
                let s2 = new Set(arr2);
                if(s2.has(item)){
                    return true;
                }else{
                    return false;
                }
            })
*/
         //3.并集 
         let union = [...new Set([...arr,...arr2])];
         console.log(union);
        //4. 差集;
        let diff = [...new Set(arr)].filter(item => !new Set(arr2).has(item))
        console.log(diff);
    </script>
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